"I am breastfeeding and pumping," the 28-year-old Australian native told Sydney's Herald Sun. "When I am at work, I am pumping. I feel like a milk maid, but it is worth it."

Kerr gave birth to Flynn -- who weighed in at 9-pounds, 12 ounces -- in January. He's the first child for the Victoria's Secret model and hubby Orlando Bloom. The secret behind her quick weight loss? Breastfeeding. "He's a hungry little boy," she told Us Weekly in April.

Kerr admitted she "didn't realize how challenging it is being a mother and working," but said her main focus is being a mom to Flynn, 7 months, and wife to Bloom, 34. "My priority is to be with [Flynn]," she told Sydney's Herald Sun. "So I am very selective with [the jobs] I do."